2014/10/16 上午 08:26:21

android Programming Glossary: theta

Android Custom Layout - onDraw() never gets called

http://stackoverflow.com/questions/13056331/android-custom-layout-ondraw-never-gets-called

w r l float h b t rect new RectF w 8 h 8 7 w 8 7 h 8 float theta float 2 Math.PI getChildCount for int i 0 i getChildCount i.. Math.max w h 2 float centerX rect.centerX w FloatMath.cos theta float centerY rect.centerY h FloatMath.sin theta v.layout int.. theta float centerY rect.centerY h FloatMath.sin theta v.layout int centerX half int centerY half int centerX half..

Calculating the angle between the line defined by two points

http://stackoverflow.com/questions/2676719/calculating-the-angle-between-the-line-defined-by-two-points

center_y is the point at the center of the screen. theta is measured counter clockwise from the x axis. Then delta_x.. Then delta_x touch_x center_x delta_y touch_y center_y theta_radians atan2 delta_y delta_x Edit you mentioned in a comment..

Implement page curl on android?

http://stackoverflow.com/questions/3912849/implement-page-curl-on-android

section intersected by our vertex in 3D space. r R sin theta Angle subtended by arc ST on the cone cross section. beta.. by arc ST on the cone cross section. beta asin vi.x R sin theta MAGIC v1.x r sin beta v1.y R A r 1 cos beta sin theta v1.z.. sin theta MAGIC v1.x r sin beta v1.y R A r 1 cos beta sin theta v1.z r 1 cos beta cos theta Apply a basic rotation transform..

Page curl/turn effect in Android [duplicate]

http://stackoverflow.com/questions/4376962/page-curl-turn-effect-in-android

Looking for fast image distortion algorithms

http://stackoverflow.com/questions/5542942/looking-for-fast-image-distortion-algorithms

Point mid new Point mid.x nWidth 2 mid.y nHeight 2 double theta radius double newX newY for int x 0 x nWidth x for int y 0 y.. int y 0 y nHeight y int trueX x mid.x int trueY y mid.y theta Math.atan2 trueY trueX radius Math.sqrt trueX trueX trueY trueY.. radius Math.max mid.x mid.y newX mid.x newRadius Math.cos theta if newX 0 newX nWidth pt x y .x int newX else pt x y .x..

How do I draw an arrowhead (in Android)?

http://stackoverflow.com/questions/6713757/how-do-i-draw-an-arrowhead-in-android

double length double angle int points new int 2 double theta Math.toRadians angle result 0 centerX int length Math.cos theta.. Math.toRadians angle result 0 centerX int length Math.cos theta result 1 centerY int length Math.sin theta return points I.. length Math.cos theta result 1 centerY int length Math.sin theta return points I have taken a look at the following threads..

How to calculate distance between two locations using their longitude and latitude value

http://stackoverflow.com/questions/6981916/how-to-calculate-distance-between-two-locations-using-their-longitude-and-latitu

double lat1 double lon1 double lat2 double lon2 double theta lon1 lon2 double dist Math.sin deg2rad lat1 Math.sin deg2rad.. deg2rad lat1 Math.cos deg2rad lat2 Math.cos deg2rad theta dist Math.acos dist dist rad2deg dist dist dist 60 1.1515 return..

Android Custom Layout - onDraw() never gets called

http://stackoverflow.com/questions/13056331/android-custom-layout-ondraw-never-gets-called

void onLayout boolean changed int l int t int r int b float w r l float h b t rect new RectF w 8 h 8 7 w 8 7 h 8 float theta float 2 Math.PI getChildCount for int i 0 i getChildCount i View v getChildAt i w rect.right rect.left 2 h rect.bottom.. w rect.right rect.left 2 h rect.bottom rect.top 2 float half Math.max w h 2 float centerX rect.centerX w FloatMath.cos theta float centerY rect.centerY h FloatMath.sin theta v.layout int centerX half int centerY half int centerX half int centerY.. float half Math.max w h 2 float centerX rect.centerX w FloatMath.cos theta float centerY rect.centerY h FloatMath.sin theta v.layout int centerX half int centerY half int centerX half int centerY half Well there are almost NONE good and deep tutorials..

Calculating the angle between the line defined by two points

http://stackoverflow.com/questions/2676719/calculating-the-angle-between-the-line-defined-by-two-points

to top. touch_x touch_y is the point selected by the user. center_x center_y is the point at the center of the screen. theta is measured counter clockwise from the x axis. Then delta_x touch_x center_x delta_y touch_y center_y theta_radians atan2.. screen. theta is measured counter clockwise from the x axis. Then delta_x touch_x center_x delta_y touch_y center_y theta_radians atan2 delta_y delta_x Edit you mentioned in a comment that y increases from top to bottom. In that case delta_y..

Implement page curl on android?

http://stackoverflow.com/questions/3912849/implement-page-curl-on-android

vi.x vi.x pow vi.y A 2 Now get the radius of the cone cross section intersected by our vertex in 3D space. r R sin theta Angle subtended by arc ST on the cone cross section. beta asin vi.x R sin theta MAGIC v1.x r sin beta v1.y R A r 1 cos.. by our vertex in 3D space. r R sin theta Angle subtended by arc ST on the cone cross section. beta asin vi.x R sin theta MAGIC v1.x r sin beta v1.y R A r 1 cos beta sin theta v1.z r 1 cos beta cos theta Apply a basic rotation transform around.. by arc ST on the cone cross section. beta asin vi.x R sin theta MAGIC v1.x r sin beta v1.y R A r 1 cos beta sin theta v1.z r 1 cos beta cos theta Apply a basic rotation transform around the y axis to rotate the curled page. These two steps..

Page curl/turn effect in Android [duplicate]

http://stackoverflow.com/questions/4376962/page-curl-turn-effect-in-android

Looking for fast image distortion algorithms

http://stackoverflow.com/questions/5542942/looking-for-fast-image-distortion-algorithms

int nHeight b.getHeight Point pt new Point nWidth nHeight Point mid new Point mid.x nWidth 2 mid.y nHeight 2 double theta radius double newX newY for int x 0 x nWidth x for int y 0 y nHeight y pt x y new Point for int x 0 x nWidth x for int.. y 0 y nHeight y pt x y new Point for int x 0 x nWidth x for int y 0 y nHeight y int trueX x mid.x int trueY y mid.y theta Math.atan2 trueY trueX radius Math.sqrt trueX trueX trueY trueY double newRadius radius radius Math.max mid.x mid.y newX.. Math.sqrt trueX trueX trueY trueY double newRadius radius radius Math.max mid.x mid.y newX mid.x newRadius Math.cos theta if newX 0 newX nWidth pt x y .x int newX else pt x y .x 0 pt x y .y 0 newY mid.y newRadius Math.sin theta if newY..

How do I draw an arrowhead (in Android)?

http://stackoverflow.com/questions/6713757/how-do-i-draw-an-arrowhead-in-android

ArrowHead This is where I'm confused private int findArrowPos double length double angle int points new int 2 double theta Math.toRadians angle result 0 centerX int length Math.cos theta result 1 centerY int length Math.sin theta return points.. double length double angle int points new int 2 double theta Math.toRadians angle result 0 centerX int length Math.cos theta result 1 centerY int length Math.sin theta return points I have taken a look at the following threads for guidance http.. 2 double theta Math.toRadians angle result 0 centerX int length Math.cos theta result 1 centerY int length Math.sin theta return points I have taken a look at the following threads for guidance http www.java forums.org awt swing 6241 how u rotate..

How to calculate distance between two locations using their longitude and latitude value

http://stackoverflow.com/questions/6981916/how-to-calculate-distance-between-two-locations-using-their-longitude-and-latitu

android share improve this question private double distance double lat1 double lon1 double lat2 double lon2 double theta lon1 lon2 double dist Math.sin deg2rad lat1 Math.sin deg2rad lat2 Math.cos deg2rad lat1 Math.cos deg2rad lat2 Math.cos deg2rad.. double dist Math.sin deg2rad lat1 Math.sin deg2rad lat2 Math.cos deg2rad lat1 Math.cos deg2rad lat2 Math.cos deg2rad theta dist Math.acos dist dist rad2deg dist dist dist 60 1.1515 return dist private double deg2rad double deg return deg Math.PI..